Spring.



L. I. LEN.

SPRING. nrLxo'urol Huw 21.11. ma.

903,587. .Pmnted Nov. 10,1903.

a MQW@ ATTORNEYS UIS Y, LEN, O FSAN JUAN., PORTO RICO.

. IRNG.

Specification of Letters Patent.

Appiicationniea April 1 7, isos. serial No. 427,706

rically inrelation to each other for the purposeof increasing the durability and the 4ehislzioity of 4the metallic members of 'the 15 arts abound with artifices for Vthe'production of elastic surfaces, it is a fact that the. forms 0f springs have not been given as much atf ten-tion as seine other features of oonstruc-v tion.

It happens that oakum', leather disks, and` flibber'in its various forms are employed in parts of machines Where metal would 'be 25 much beter for the purpose. Rubber would f apparently fulfill many of the conditions exacted of'a. perfect spring, if it were. not so expensive and ldid not decon'iposefso rapidly whentlie.- extent of its vulcanizatio'n is only- 8.0.-

'serve the rubber, such means `iifould neces-- l lsarily detract from the elasticity of the rub- `ber,-1yhich is its most' important physical quality.

The springs of my invention are intended, as far as practicable, to take the place 'of rubber and are believed to be, for many pui'- oses, much. more suitablethan the latter, .rl'hese sprin s have the advantage of econoiny', dui'abi ity and great elastic-ity, as coniared with rubber, and further 4are Well adapted to resist extreme teni ieratures Reference is to be had to tlio accompanying drawings forming a part of this specific'ation, in which similar characters of refe:A en eeindicate corresponding parts in all the figures. Figure 1 isa perspective, showing one ofim improved springs consisting of two meta lic ribbons arranged together as a .a.ii-,- eachfribbori being wound upon itself an dis. posed in a definite symmetrical relation to the other ribbon; Fig. .2 is :1. plan view of the construction shown in-Figr. 1, and oxhow ine-tellin rubens-.s ein I tertwined sotliat eonvolutions of one rit -ese two members being disposed symrnetspring;

Alt ough the industrial. und mechanical'.

slight. however, means be taken to prehaveya definite relation?toflmtvollutdif of 4the other ribbon, certifichi phntsolzewelidibbon 'being disposed substn;nti itll.' same plane as corresponding ,pain-smi thel other ribbon; Fig. 3 is a sdeie G0 evetior'igsrwin 'a part of one ofthe ribbonsyithis viewlfegthi it` ing two pairs oi c'bn-voli'1fti'orrs'i-"ttiese twopairs beinv" spaced WidelyiapartgiWndliFig. 1 a sidedlevation showing "sigl'eafair of cfoiivolutions close togethe' mi .Acontinuous i'ibbo'n 5 of' other nieta-i, is pro'vbifded l' 6,V 7 so wound that the rotation the sanie'-direction. Anotlie similarly provided with cbvolt-iislf), 10.

The convolutons 6, iffareconii'ectetl by a portion 1l, the eonvolutions" similarly connected-*by iioi'tions pair of convolutioiis 9, l() is co'nne ed with the next succeeding??pairfby' 'portion 13. Similarly each pair-H6, 17 c oviitib is connected with the next4 snceeediiigpir by a portion 14. Vhenthe two ribbons 5, 8 are placed together, as in Iig. 2, it Will be noted that'different portions of the one ribbon are disposed concentrically to somewhatanalogous portions of the other ribbon, so that the two ribbons occupy a minimum of It will also be noted that from one end ofthe Spring to the other' the convolntions of one ribbon arearranged symmetrically with relation to the convoliitioiis of the 4other ribbon, the General principle of construction being clear .from Figs. 2- and 3.

Referring lmore particularly to Fig. 1, it will be noted'tliat the diameter of the con! vol'utions 6, 7 should never be so great thatwheii the spring is relaxed these convoluf tions will be brought into engagement 'with the convolutions l0 tothe left of the convod Kliitions 6, oi' 9 to the rightl of theV convol'uf tions 7.

- '.lhe'springs above described niay be. either of the socalled extension type Aor .the so'- called compression 7 type, dept-ending-upon the use to which the spiii'igs are to beplaced, They may also be used oxteriorly or intelriorly with reference to hollow objects to "which they are applied, [n carriage Wheels, pump pistons vand 'similar apparatus, 're-- quiringr expansive pressure, they act as'eompression springs. l i applying the springs to any surface i?. is desired to render elastic, the rib-.-

i are always employed. in. pairs, one be- .form'-given to the convo 'after the mannerof other convolutions for departing from It will be'noted that the two ribbons,

ing right-handed and libelo-ther leftihanded.

By this means there may be4 obtained a'n surfers of ing a -widthequal to or sli i -thewidth of one ofthe ri j While ,for convenience I be understood that the :parallel to Veach jother throughout-a goodl -portion of their respective lengths, as indi-f cated in Fig. 2, are isposed compactly, and

yetthis compactness'-does not interfere -with of movement 'due tothe a reasonable'de shortening 'of the spring as lenrthening an' a w ole, and consequently to the contraction 'and'ejrpansion of Vthe individual convolutions.

Having-'thusdescrbed my invention, I

I .claim as new and desire to secure by Letters Patent: b 1'; Aspring comprisin 4a plurality'of ri bons Vof 1'es'ilie1i t materia?, each ribbon being.

bent to form convolutions, the convolutions disposed `int 'Y beinglof each ribbon being,spaced,- so as to form pairs separate by intervals, the two ribbons being intertwined so that a pair of coV lixtlons of one ribbon is Unligte successive convolutions of the other ribbon.

art unetjiiallf 2. A sprmg 'com rising a pair-oflribbons each providedk 'wit closely togtether in groups, separated ing general y the rou s "fin'g wide intervals, sai -rib 'ons beparallel with each 'otherfand -so disposed that -a- .group of convolution' of each ribbon `mate-an interval between groups of convolutions of the other ribbon.

3. A spring comprisin a plurality of ribbons of resilient materia eachribbon being length so that itsconvolutions occupy two distinct'4pla'nes, said ribbons being so intertwined with 'eachother that the `two planes of one ribbon coincide with thetwo planes of the other ribbon.

In testimony whereof I have signed my name to this specilcation in the presence of two subscribing Witnesses.

LUIs' Y. LEN.

Witnesses:

S. M. WooDsoN, LEE Wimmz.

convolutions dis lUSed;

bent toform onvolutions, and also being bent slightly. 1naf direction -lateral .to its 

